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Kayhan Tejarat Honamic Trading Company (Private Joint Stock) in order to carry out commercial activities …

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Products

Steel sections and raw materials required by steelmakers are among the main products of Kayhan Honamic Trading Company.

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No. 7, Unit 2, Corner of Mehrshad St., Soltani St. (Africa), Africa Blvd., Tehran

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Products

Rebar

Rebar is a long and solid steel section that can be said that there is no construction project that can be completed without the use of rebar. Rebars are divided into two categories, simple and ribbed, and the simple type has no ribs, while the other three types have protrusions and have various uses. Simple rebars are known as A1 in the industry and fall into the category of soft rebars. Three other types of this product are introduced with the names of A2, A3 and A4, which have more current stress and rupture than simple rebars and are used in many cases.

Rebar manufacturing steps:

The steel ingot is melted in a furnace at 1100 ° C and then guided into the furnace in specific rows with the help of a hydraulic jack to prepare it for rolling. The rollers installed in the rolling machine bring the steel to the desired standard diameter in 3 steps by applying pressure and tension. After rolling, the rebars are sent to the dowel stands. To prepare A2 ribbed rebar, sanding is done at the same rolling stage; But other types of rebars are hardened after cooling and at room temperature.

مراحل ساخت میلگرد:

شمش‌ فولادی را در کوره‌ با حرارت 1100 درجه سانتی‌گراد به حالت مذاب درآورده و سپس با کمک جک هیدرولیکی در ردیف‌های مشخص به داخل کوره هدایت می‌کنند تا برای نورد آماده شوند. غلتک‌های تعبیه‌شده در دستگاه نورد، طی 3 مرحله با اعمال فشار و کشش، فولاد را به قطر استاندارد موردنظر می‌رسانند. بعد از اتمام نورد، میلگردها به استندهای آج‌زنی فرستاده می‌شوند. برای تهیه میلگرد آجدار A2، آج‌زنی در همان مرحله نورد صورت می‌گیرد؛ اما انواع دیگر میلگرد، بعد از خنک شدن و در دمای محیط آج‌زنی می‌شوند.

 

Applications of ribbed rebar:

1- Construction of different types of foundations (foundation)

2- Construction of various concrete walls

3- Making different types of beams with simple or compound geometric cross section

4- Making different types of columns

5 – Construction of vertical girders in brick buildings (The main task of the girder, which is made by joining the chain of rebars together, is the connection of foundations or vertical foundations to each other.)

6- Making different types of roofs (slabs) for reinforced concrete

Girder

Due to its wide application in the construction industry, beams are produced in a variety of standards and with different characteristics. Beam is one of those steel sections that has a colorful presence in any construction project by enduring the stresses caused by bending moment and shear force. In general, three standards of this product are produced and marketed by manufacturers. IPB beams or wide wing, IPE beams that are made according to European and Chinese standards, and finally INP beams are produced under the standards of Russia and China.

Winged beams, or IPB for short, have a wide appearance. There are two main characteristics of L and V in this type of section, L indicates light weight (IPBL) and V indicates heavy weight (IPBV) of the product. IPE beams are the second type of these sections. It has an I-shaped appearance and is the same thickness across the wings. This type of standard has more buyers in Iran. Finally, the third type of these sections is INP, which has the appearance of I, with the difference that the thickness of the wings decreases as it moves away from the soul, so that if you look at the length of this product, the wings are thin at first. It gets thicker at the end.

The beams available in the market are divided into two types, light and standard, and Isfahan Zobahan beam is the best domestic product and has a standard weight.

 

Corner

Steel profiles that have an L-shaped cross section are called angles in the industry. Among the types of steel corners, we can mention two types of presses and fabric. As the name of these products indicates, the corner press is made of a sheet with a length of 6 meters, which bends in the middle of the width and forms a corner, so this product is produced from steel sheet.

This is while the corner of the fabric is taken out of the production line as a final product from the very beginning. In another category, this steel section is divided into two types of equal wings and unequal wings. In equal wing sections, in building plans, the size of the wing is entered individually after the letter L, and in the corners of unequal wings, the size of two wings is given after the letter L. It is possible to distinguish these two sections easily after observing them. Sections with unequal wings are used in certain industries and are produced and marketed in different dimensions and thicknesses.

Studs

Studs are one of the most widely used U-shaped profiles in the industry, which are used in different types for different applications. In general, studs are divided into two categories: press and fabric, so that the type of press is produced by the press method and the type of fabric is removed from the production line as a stud from the very beginning. In another category, this product is divided into two categories, lattice and simple. The difference between these two categories is only in the product rolling method, so that simple studs are produced by hot rolling method and by hot sheets, and if necessary, they are galvanized during other stages, but mesh studs are produced in both cold and hot forms. To be.

Gutter production standards include the French standard NF A 45-255, the corrosion resistant gutter standard DIN EN ISO 12944-3 and the UNP and UPN European gutter standard DIN-1026. Gutters have many applications in various industries, including the use of frames, machinery, buildings, marine structures and construction equipment.

Direct Reduced Iron

Sponge iron or DRI (Direct Reduced iron) is produced from direct reduction of iron ore. In this method, oxygen is extracted from the iron ore and the final product will be porous in the form of spherical balls. The presence of these cavities has led to this product being called sponge iron.

Applications of sponge iron

Applications of sponge iron include its use as an iron scrap in the smelting process. The applications of sponge iron in induction furnaces are much higher than other melting methods; Because in this method, with sufficient experience and knowledge, about 50% of sponge iron can be replaced with scrap iron.

In Iran, the use of sponge iron in induction furnaces began in 2010 in one of the factories in Yazd. Of course, at that time, because the amount of scrap iron, although of low quality, was very high; The need to use sponge iron did not seem necessary. On the other hand, the initial experiences of sponge iron applications were not very desirable; Because of not knowing the proper methods, the melting time was long and a terrible slag was obtained.

With the increase of knowledge and improvement of smelting methods, today the problems of using sponge iron instead of scrap iron have been minimized and this product is used in many small and large steelmaking units.

کاربردهای آهن اسفنجی

از کاربردهای آهن اسفنجی می‌توان به استفاده از آن به‌جای ضایعات آهن در فرایند ذوب اشاره کرد. کاربردهای آهن اسفنجی در کوره‌های القائی بسیار بیشتر از دیگر روش‌های ذوب است؛ زیرا در این روش می‌توان با داشتن تجربه و دانش کافی، نزدیک به ۵۰ درصد آهن اسفنجی را جایگزین آهن‌قراضه کرد.

در ایران از سال 1389 در یکی از کارخانه‌های یزد استفاده از آهن اسفنجی در کوره‌های القایی آغاز شد. البته در آن زمان به دلیل اینکه مقدار آهن‌قراضه هرچند با کیفیت پایین، بسیار زیاد بود؛ نیاز به کاربرد آهن اسفنجی چندان ضروری به نظر نمی‌رسید. از طرفی تجربه‌های اولیه کاربردهای آهن اسفنجی هم زیاد مطلوب نبود؛ زیرا به دلیل عدم شناخت روش‌های مناسب، زمان ذوب طولانی می‌شد و سرباره وحشتناکی نیز حاصل می‌گردید.

 با افزایش دانش و بهبود روش‌های ذوب، امروزه مشکلات به کارگیری آهن اسفنجی به‌جای ضایعات آهن به حداقل رسیده و از این محصول در بسیاری از واحدهای کوچک و بزرگ فولادسازی استفاده می‌گردد.

What is a briquette?

Briquette is the same as sponge iron or DRI, which at the time of production is formed into large compact pieces that are divided into three categories.

Types of briquettes:

Hot sponge iron briquettes

Soft sponge iron briquette

Cold sponge iron briquettes

Benefits of sponge iron

  • Suitable alternative for scrap in steelmaking units

    High quality metalworking

    Less sulfur and phosphorus

    Less waste elements than scrap iron

    Can be used as an alternative cooling agent for iron scrap in oxygen units and furnaces

    Higher grade than crude iron

    Ease of transporting and storing spongy iron (HBI)

Density of sponge iron

Sponge iron has a higher density than scrap iron, so less scrap iron can be charged to the furnace. The density of sponge iron in the form of lumps is 1.80 gm / cc and in the form of soft 1.75 gm / cc and its grade is between 84 to 95%.

Dangers of sponge iron

Oxidation and corrosion are the dangers of sponge iron; Therefore, protection should be provided for it and if possible, they should be turned into steel as soon as possible. Other dangers of sponge iron include the possibility of ignition in the paste state.

To prevent the oxidation of sponge iron, this product can be protected by neutral gas, sodium silicate, lime and then placed indoors and briquettes.

Chemical formula of sponge iron

The chemical formula of sponge iron is special and is produced according to special conditions. Reduction of oxide to metal occurs in several stages and in each stage, by removing oxygen, different oxides are produced. The chemical formula of sponge iron occurs as follows:

C + O2 = CO2

CO2 + C = 2CO

Fe2O3 + CO = Fe3O4 + CO2

Fe3O4 + CO = FeO + CO2

FeO + CO = Fe (Metallic) + CO2

It should be noted that the amount of oxygen reduction in each step is equal to:

11%

22%

67%

The following table shows the percentage of chemical elements in sponge iron:

Chemical composition (chemical formula) of sponge iron

Row

Element

Percentage

1

Fe total

85.9% to 86%

2

Metallization

At least 90%

3

Fe Metal

78.5% to 82%

4

C

1.3% to 2%

5

Maximum 0.01%

6

Maximum 0.1%

7

SiO2

Maximum 5.5%

8

Al2O3

Maximum 1%

9

CaO

Maximum 1.1%

10

MgO

Maximum 2.5%

Method of production of sponge iron

The method of producing sponge iron is to use non-coking coal through the process of reducing iron ore in a rotary kiln. The method of producing sponge iron is done at a certain temperature and control atmospheric pressure. Midrex USA was the first company to produce sponge iron, and the first method of producing sponge iron is named after this company.

The types of sponge iron production methods are listed below:

MIDREX method HYL method SL / RN method Jindal Method DRC method | Purofer method

Degree of metallization of sponge iron

Some of the iron in sponge iron is free and some is in the form of iron oxide. The degree of metallization of sponge iron or the degree of its ironing is, in fact, the amount of free iron in sponge iron.

For example, if the degree of metallization of sponge iron is 91% and the total iron content of sponge iron is 91%, the product of these two numbers is the amount of iron present in pure sponge iron.

Sponge iron has unique properties that have made it a viable alternative to scrap iron in the steel industry. This substance is known as sponge iron due to its lack of oxygen and its porous shape. About 5% of the world’s steel is currently produced from sponge iron (DRI) and this trend is increasing. In Iran, steel production through direct reduction and electric furnaces is in line with the policies of the National Steel Company and the Ministry of Industry, and therefore sponge iron can play an effective role in the steel industry and the country’s economy.

Nickel

This transition element is a group of iron and cobalt elements and is similar in terms of magnetic properties and chemical activity. The main minerals of this element are pentlandite, pyrrhotite (nickel and iron sulfides) and garnierite (nickel and magnesium silicate).
This metal is very durable in air and water and does not oxidize. For this reason, it is used to produce coins, metalworking, brass and iron, as well as to make chemical tools in special alloys such as German silver.

Properties of Nickel

This metal has good mechanical properties and excellent resistance to corrosive environments.

This metal maintains its strength at high temperatures

Nickel is about the hardness of steel and combines easily with sulfur and arsenic.

This metal is very durable in air and water and does not oxidize.

Nickel is very valuable for the alloys it produces.

Nickel can be present both as a metal and as a soluble compound.

ویژگیهای نیکل

  • این فلز دارای خواص مکانیکی خوب و مقاومت عالی در برابر محیط های خورنده است.

  • این فلز استحکام خود را در دمای بالا حفظ می کند

  • سختی نیکل در حدود فولاد بوده و به‌راحتی با گوگرد و آرسنیک ترکیب می‌شود.

  • این فلز دوام زیادی در هوا و آب داشته و اکسید نمی‌شود.

  • نیکل برای آلیاژهایی که بوجود می‌آورد، بسیار با ارزش می‌باشد.

  • نیکل هم به صورت فلز و هم به صورت ترکیب محلول می تواند وجود داشته باشد.

ویژگیهای نیکل

Applications of Nickel

  • Manufacture of chemical tools in special alloys
    Machine parts
    Application of nickel-chromium coating for food industry
    Chemical industry plumbing
    Manufacture of stainless steel (about 65% of world nickel consumption) and alloy steel
    Application as a super alloy (12% nickel consumption)
    Rechargeable batteries
    Casting and sheet making products
    Armor sheets and anti-theft doors and anti-theft safes
    Plants used in chemical laboratories
    Chrome plating industries
    Automotive industries, tankers and trains in the field of construction and machinery.
    Steel industry for the production of dishwashers, washing machines and kitchen utensils
    Construction and electronics industries
    Use of copper-nickel-tin alloy in springs, paper clips and terminals

فروش انواع نیکل وارداتی